/** Explicit value-axis bounds that put the zero line at the same height. */
export interface AlignedScale {
    min: number;
    max: number;
    tickAmount: number;
}
interface AxisRange {
    low: number;
    high: number;
    integer: boolean;
}
/**
 * Two value axes compute their zero independently, so bars on them would grow
 * from different baselines when either holds negative values. Choose one split
 * of tick segments below and above zero, and give each axis a nice step that
 * fits it, so both zero lines land on the same gridline.
 * Returns `null` when no axis has a negative value (Apex scales them itself).
 */
export declare function alignZeroScales(ranges: [AxisRange, AxisRange]): [AlignedScale, AlignedScale] | null;
export {};
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